you guys ever use Evapo-Rust? Got it at harbor frieght works on gun bluing too. When its used up just dump it biodegradable no fumes. Heres some pics of heater core after 48 hrs. But being safe it's probably not as cheap. I just use old plastic bins. Just a thought.
http://www.onlycubcadets.net/forum/i...s/Biggrin2.gif